Manufacture of copying-paper.



vneat copies thereon In 0 UNITED STATES PATENT oFFroE;

ANTONIO PIDELASERRA Y BRIAS AND MARIANO PIDEliASERBA Y BRIAS, ,OF

, i BARCELONA, SPAIN. I

MANUFACTURE OF COPYING-PAPER.

Specification of Letters Patent.

Patented Oct. 20,1908.

' Application filed. larch 13, 1908. S eriaI No. 420,840.

To all whom it may concern:

Be it known that we, ANTONIO Fromm-,-

SERRA Y BRIAS and MARIANO PIDELASERRA Y BRIAS, manufacturers, of Barcelona, Spain, residing at Barcelona, in the Province of Barcelona and Kingdom of Spain, have invented certain'new and useful Improvements in the Manufacture of Copying-Paper; and we do hereby declare the following to be a full, clear,- and exact description of the inwithout previously moistening the paperf To this end, said papers are impregnated with a solution of an hygroscopic salt with or without glycerin, or they are nnpregnated with a mere solution of glycerin more or less diluted in water according to 'the efiect to' be produced. While these papers may take press-copies more or less neat and perfect according to the preparation they have un-' dergone and also according to the means adopted for copying; yet it is well known that the dampness that they possessicauses paper and there will the ink to spread in the come a time when it wi 1 not be possible to read these copies. On the other hand, the constant moisture of the pa or makes it less durable and offers great o jections to the handling of the sheets or ll aaves, either when turning them over-to find a given copy, or when choosing the sheets to take them out and kee them in the files 'wi'thiother docu ments; cause the paper at prepared does not rove resistant enough and becomes injur very easily;

It has been found in practice that the pa 'er should have aslittle moisture as possib e. to take the'ink'well, and its'touch should'be the same "as dry aper; These'results may-be obtained by addin the solution of glycerin or of hygroscopic sa t in so small a'quantity that the paper cannot take press- 1 require a l very heavy ressure to take 7 er to fix the ink, the glycerinrbath or the solution of an bygrosfoopic salt, is prepared with asolution of ut experience has shown that with a 2 per 10s in the ordinary copying presses; .but'

allic acid which renders the paper able to xythe ink when taking the copy and there.

fore the ink or color does not spread at all;

I but the copies will remain neat and inalterable whatever may be the timeelapsed. The percentage of gallic acid added to the solu-' tion depends on the effect to beproduced. A too heavy percentage of gallicacid would soak'into the original writing and so'fix the ink therein that no more copies could be taken thereof.

In order to give thepaper a dry touch and the necessary strength to be easily manifolded and to prove as durable as the ordinary c0 ying paper- (which needs to be previous y moistened for copying), to thebath above referred to is added a quantity of saponified Wax and honey. We mean. by saponified wax the product obtained by adding wax in the saponifying process, or the product obtained by mixing soap and wax in equal parts andheating them together in-a sultable receptacle. The proortions of. these ingredients are variable cent. saponified wax and a 15 percent. honey added to the bath, good resu ts may be obtained. The class of paper which lends itself\b'est to that use, is woodpulp paper. The time of passage of the paper through the bath should not exceed the time just necessary for the absorption of the liquid, when it is dried and then calendered or cylindered. The aper thus obtained is bright, strong and urable.'

For the wax and honeymay be substithe paper similar properties. Instead of wax, we may employ for instance ceresin, stearin, tallow, or other like materials; and in lieu of honey we ma employ suigar molasses, glucose, or the ike. Instea oi gallic acid we may choose some other acid among colors.

,tuted other materials which can impart to those usually employed for fixing' 160 The moistenin operation or passa e of the paper in the ath is carried outwit the aper in sheets or in endless bands, and also y the same or similar means or machines that are usually emplo ed in paper manufacture or ,in similar in ustries. i

It will thus be seen that the glycerin or hygroscopic salt serves to holdenough moisture in the paper to' efiect the copying process; that the saponified wax and honey serve to give the paper a. dry touch and to prevent its tearing when handled; and that I the gallic acid readily combines with the ink of the paper tov be copied, serving to soften the same, to make it more acid, and to fix it and thereby prevent it from spreading.

What we claim is 2-- 1. The process of producing copies from impressions made'in ink which consists in taining a hygroscopic compound to which has been added gallic acid and saponified wax, substantially as described.

3. The method of preparing sheets of paper for use in copying, which consists in impregnating said sheets with a solution containing glycerin, gallic acid, saponified wax, and honey, substantially as described.

. 4. The method of preparing sheets of paper for use in copying, which consists in impregnatin said sheets with a SOl UtiOII containing g ycerin, gallic acid, saponified wax, and honey, and then calendaring said paper, substantially as described.

In testimony whereof, we aflix our signatures, in presence of two witnesses.

ANTONIO PIDEUASERRA Y BRIAS. .MARIANO PIDELASERRA Y BRIAS. Witnesses: STANLEY G. HARRIS,/

CoNs'rAN'rINo' LUPER CID. 

